이란 사실을

the fact that

→ 이다
phrase Rare #32,341
the fact that Follows a statement or description to present it as a fact, often as the object of a verb such as “know,” “hide,” or “tell.” Here, 이란 is a shortened form of 이라는.
KO: 마법사가 사기꾼이란 사실을 알려야 해.
EN: You have to tell them the fact that the wizard is a fraud.

가서 마법사가 사기꾼 이란 사실을 알려야 해.

We need to go tell them that the wizard is a fraud.

— 위키드: 포 굿 (2025)